The Gerasimov-Drell-Hearn sum rule and the single-pion photoproduction multipole E0+ close to threshold

Abstract

The long-standing discrepancy between the Gerasimov-Drell-Hearn sum rule and the analysis of pion photoproduction multipoles is greatly diminished by use of s-wave multipoles that are in accord with the predictions of chiral perturbation theory and describe the experimental data in the threshold region. The remaining difference may be due to contributions of channels with more pions and/or heavier mesons whose contributions to the sum rule remain to be investigated by a direct measurement of the photoabsorption cross sections.

9 pages, latex, 1 figure, to appear in Phys. Rev. D

References in corpus (2)

• Multipole analysis of pion photoproduction based on fixed t dispersion relations and unitarity
• A dispersion theoretical approach to the threshold amplitudes of pion photoproduction

Cited by in corpus (13)

• First measurement of the Gerasimov-Drell-Hearn integral for Hydrogen from 200 to 800 MeV
• A measurement of the axial form factor of the nucleon by the p(e,e'pi+)n reaction at W=1125 MeV
• The GDH Sum Rule and Related Integrals
• Polarizability of the Nucleon and Compton Scattering
• Fixed-t subtracted dispersion relations for Compton scattering off the nucleon
• Parameterisation of σ_{1/2}-σ_{3/2} for Q^2 \geq 0 and non-resonance contribution to the GDH sum rule
• Spin polarisabilities of the nucleon at NLO in the chiral expansion
• Compton scattering from the proton at NLO in the chiral expansion
• The Q^2-dependence of the Generalised Gerasimov-Drell-Hearn Integral for the Proton
• The Generalized Gerasimov-Drell-Hearn Integral and the Spin Structure of the Nucleon
• Polarizabilities of the nucleon and spin dependent photo-absorption
• Generalized polarizabilities and electroexcitation of the nucleon
• The correction of hadronic nucleus polarizability to hyperfine structure of light muonic atoms